Former Guns N’ Roses bassist Duff McKagan threw a well-known conspiracy theorist out of a book signing in Seattle last week for questioning whether Kurt Cobain seemed depressed before his 1994 suicide.

McKagan shared a Seattle-bound flight with Cobain just days before the suicide, and was one of the last people to speak with the Nirvana frontman. Cobain had just escaped from a Southern California drug rehab center, and he and McKagan sat next to each other in first class.

McKagan recently told VH1: “We talked. We were both sort of in the same boat. A couple guys recognizing where each other was at. It’s no fun being that completely and utterly addicted.”

Anyone who frequents public meetings in Seattle probably recognizes the man questioning McKagan.

Richard Lee ran for mayor of Seattle mayor in 2001 and 2005, and he often shows up at meetings and public events. But he’s best known for making the accusation that Cobain’s death was a homicide.

Lee had a public access TV show in the 1990s called “Now See It Person To Person.” He later changed the show’s name to “Now See It Person To Person: Kurt Cobain Was Murdered.”

Several people connected with Cobain sought restraining orders against Lee, including Nirvana bassist Krist Novoselic. Former Seattle mayor Greg Nickels sought a mild restraining order against Lee after he refused to stop questioning the mayor at an event in 2005.

Lee is also banned from Powell’s Books in Portland after a similar incident at a reading with Norm Stamper, Seattle police chief at the time of Cobain’s death.